Clemson MGT 3100

Two random samples are independent if the process that generates one sample is the same as the process that generates the other sample

False

The degrees of freedom can sometimes be a decimal, depending on our assumption of equal or non-equal variances

True

A pooled estimate of the variance is really just a ___________

weighted average

A pooled estimate of the variance is used when the variances of each population are unknown and we cannot assume that they are equal

False

the sampling distribution of the difference in mean is assumed to be a ______

normal distribution

The standard error used in a two-sample mean confidence interval is different than the standard error used in a two-sample hypothesis test

false

For most purposes in this class d0 will be

zero

in the real world, we usually do not know what the population variances are, so before we proceed with our analysis, we must determine if the population variances are____

equal

the symbol d0 is used to notate the difference between the hypothesized means

true

the standard sample size for the central limit theorem to take effect is

30

one example of a matched pairs experiment is when you have a before and after scenario

true

the inference procedures in regards to a matched pair experiment basically comes down to performing a one-sample t-test and/or confidence interval

true

a matched pairs design is just another name for independent sampling

false

the data in both samples in a matched pairs experiment need to be approximately normally distributed

false

the parameter of interest for a matched pairs design is the difference of means, mu1-mu2

false

the parameter to be tested and estimated in regards to the difference in two populations is

p1-p2

n1*(1-phat1),n2*phat2 and n2*(1-phat2) are all greater than or equal to __

5

when estimating a population proportion, p, we used the sample proportion, phat. What is phat?

x/n

when we draw inferences regarding proportions, we are dealing with what type of data?

categorical

nominal, categorical, and qualitative are all words that describe the same type of data

true

the alternative hypothesis in a one way ANOVA will be written in words and not with parameter notation, as we did with one and two sample tests

true

individuals or objects on which our experiment is performed are called experimental units

true

ANOVA is used to determine if there are differences between three or more population___

means

the ANOVA test is a generalization of the two sample _____

t test

ANOVA is an acronym for analysis or variances

true

using two-way ANOVA, we are able to simultaneously examine the effect of ___ factors on the population mean

two

In a RBD, we may not really care about one of the factors, but we use it to _____ the variation in the factor we do care about

reduce

RBD is an extension of the ___ we previously studied

matched pairs design

RBD reduces the variation between the samples, making it easier to detect differences within treatments

false

the term____ refers to a matched group of observations from each population

block

Factorial Design is sometimes referred to as two factor ANOVA because we care about both factors and their effect on the response variable

true

in a factorial design, the possible relationship between the factors themselves is called a/am _____

interaction

the number of observations for each combination of factors in a factorial design is called a ____

replicate

how many separate hypotheses are there in a factorial design?

3

in factorial design, you will test for the interaction between factors A and B first , before you test for the main effects A and B, themselves

true

The GoF test is an extension of the ____ test

two sample proportion

in a GoF test, we are analyzing ________ variables

one categorical

in the GoF test, we have a multinomial experiment where the sum of the probabilities of each category must sum to ___

1

in the null hypothesis for GoF test, the proportions for each category must all be equal

false

The GoF test is valid only if the expected frequencies are greater than or equal to ____

5

a chi-square test of independence is used to analyze the relationship of ________ variables

two qualitative

the null hypothesis for the chi-squared test of independence should state the variables are dependent, while the alternative hypothesis should state that the variables are independent

false

a ________ generally shows the frequencies or observed counts between two categorical variables

contingency table

the expected frequencies in a test of independence are calculated in the same manner as in the GoF test

false

one of the conditions for the test of independence to be valid is that the expected counts for each cell must be at least ___

5